Why is my power bank providing fewer charges than expected?

To estimate the number of charges: (Power Bank Capacity × 0.65) ÷ Device Battery Capacity. For example, a 5,000mAh power bank gives an iPhone 15 (3,877mAh) about 0.8 charges, and an iPhone 15 Pro Max (4,852mAh) about 0.64 charges.

How can I estimate the number of charges for my device?

To estimate charges, use this formula: (Power Bank Capacity × 0.65) ÷ Device Battery Capacity. For example, an iPhone 15 (3,877mAh) can receive about 0.8 charges, and an iPhone 15 Pro Max (4852mAh) about 0.64 charges from a 5,000mAh power bank.

iPhone 16 Portable Charger, Nano Power Bank with Built-in USB C Connector, 5,000mAh Portable Charger 22.5W, for iPhone 16/15 Series, Samsung S22/23 Series, iPad Pro/Air, AirPods, and More

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